(USATODAY.com) - New Jersey Gov. Chris Christie's chief of staff, former deputy chief of staff, a former campaign manager and the executive director of the Port Authority of New York and New Jersey are among those issued subpoenas in relation to the George Washington Bridge controversy, two news organizations are reporting.

In all, 20 subpoenas were issued to key members of the Christie administration in relation to the alleged purposeful traffic jam created in September out of political spite,The (Bergen, N.J.)Recordreports.

Kelly is the Christie employee alleged to have sent a message reading "Time for some traffic problems in Fort Lee" to a Christie supporter at the Port Authority, allegedly setting up the closure of access lanes that led to days of gridlock. Christie fired Kelly the day after the scandal broke.

O'Dowd was Christie's choice to serve as New Jersey's new attorney general,The(Newark)Star-Ledgerreports.

New Jersey Assemblyman John Wisniewski, a Democrat, toldThe Star-Ledgerthat the subpoenas are seeking documents from those who received them.

A separate New Jersey Senate panel formed Thursday will also issue subpoenas,The Star-Ledgerreports.

There was no immediate response from Christie's office but he has denied any involvement in the lane closures and has apologized.

In at least four cases, ambulances were delayed in responding to calls, and a 91-year-old woman died at a hospital in one of those cases.